Performance of the Cr[CH(SiMe3)2]3/SiO2 catalyst for ethylene polymerization compared with the performance of the Phillips catalyst
Performance of the Cr[CH(SiMe3)2]3/SiO2 catalyst for ethylene polymerization compared with the performance of the Phillips catalyst
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DOI：
10.1002/pola.10590
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发表时间：
2003-02
期刊：
影响因子：
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通讯作者：
Haruhiko Ikeda;Takashi Monoi;Yasuaki Sasaki
中科院分区：
文献类型：
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作者：
Haruhiko Ikeda;Takashi Monoi;Yasuaki Sasaki
比较了二氧化硅负载铬体系[Cr[CH(sime3) 2] 3 / sio2}与二氧化硅负载氧化铬催化剂菲利普斯催化剂（cro3 / sio2）的催化性能。该催化剂是由菲利普斯催化剂的典型二氧化硅载体在600℃下煅烧和三[双（三甲基-酰基硅基）甲基]铬（III） {Cr[CH(SiMe 3) 2] 3}在二氧化硅上的载体制备的。在浆相聚合中，该催化剂在没有有机铝化合物作为助催化剂或清除剂的情况下，对乙烯进行了高活性的聚合。每Cr的活性比菲利普斯催化剂高6-7倍。在体系中引入氢后，聚乙烯的分子量不随菲利普斯催化剂而改变，而随Cr[CH(SiMe 3) 2] 3 / sio2催化剂而降低。
The catalysis of a silica-supported chromium system [Cr[CH(SiMe 3 ) 2 ] 3 / SiO 2 } was compared with a silica-supported chromium oxide catalyst, the Phillips catalyst (CrO 3 /SiO 2 ). This catalyst was prepared by the calcining of the typical silica support used for the Phillips catalyst at 600 °C and by the support of tris[bis(trimeth-ylsilyl)methyl]chromium(III) {Cr[CH(SiMe 3 ) 2 ] 3 } on the silica. In the slurry-phase polymerization, this catalyst conducted the polymerization of ethylene at a high activity without organoaluminum compounds as cocatalysts or scavengers. The activity per Cr was about 6-7 times higher than that of the Phillips catalyst. Upon the introduction of hydrogen to the system, the molecular weight of polyethylene did not change with the Phillips catalyst, but it decreased with the Cr[CH(SiMe 3 ) 2 ] 3 /SiO 2 catalyst.